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How do I add indices to MySQL tables?
I've got a very large MySQL table with about 150,000 rows of data. Currently, when I try and run
7 Answers
...
adding multiple entries to a HashMap at once in one statement
...6) as follow:
Map<String, Integer> cities = Map.of("Brussels", 1_139000, "Cardiff", 341_000);
The var-args case for Map is a little bit harder, you need to have both keys and values, but in Java, methods can’t have two var-args parameters. So the general case is handled by taking a var-ar...
horizontal line and right way to code it in html, css
...s
.hline-bottom {
padding-bottom: 10px;
border-bottom: 2px solid #000; /* whichever color you prefer */
}
and use it like
<div class="block_1 hline-bottom">Cheese</div>
share
|
...
Hadoop “Unable to load native-hadoop library for your platform” warning
...14' not found (required by ./libhadoop.so.1.0.0)
linux-vdso.so.1 => (0x00007fff43510000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f9be553a000)
libc.so.6 => /lib64/libc.so.6 (0x00007f9be51a5000)
/lib64/ld-linux-x86-64.so.2 (0x00007f9be5966000)
Unfortunately, I stupidly overlooked the answe...
How to show popup message like in Stack Overflow
...i).fadeIn("fast");
setTimeout(i, (f ? Math.max(2500, h.length * 40) : 1000 * 30))
}
css
.error-notification{z-index:1;cursor:pointer;display:none;position:absolute;padding:15px;-moz-box-shadow:2px 2px 5px #000;-webkit-box-shadow:2px 2px 5px #000;box-shadow:2px 2px 5px #000;}
.error-notificati...
Reusable library to get human readable version of file size?
...y known binary prefixes
negative and positive numbers
numbers larger than 1000 Yobibytes
arbitrary units (maybe you like to count in Gibibits!)
Example:
>>> sizeof_fmt(168963795964)
'157.4GiB'
by Fred Cirera
sh...
Do try/catch blocks hurt performance when exceptions are not thrown?
...topwatch();
double d = 0;
w.Start();
for (int i = 0; i < 10000000; i++)
{
try
{
d = Math.Sin(1);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
w.Stop();
Console.WriteLine(w.Elap...
DateTime2 vs DateTime in SQL Server
... specific instant in time, not a time zone.
– Suncat2000
Jun 1 '17 at 12:51
6
@Porad: What exactl...
How to convert ASCII code (0-255) to its corresponding character?
...g.valueOf(Character.toChars(i)). Running a quick benchmark of converting 1,000,000 random integers in the given range (100 times, to be safe) on my machine gives an average time of 153.07 nanoseconds vs. 862.39 nanoseconds. However, in any interesting application, there will be far more important th...
MFC CString::Format()函数详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...浮点数，
Format("this is %e",-2.22);
返回的是：this is -2.220000E+000
等一下再说明如果将数的精度缩小
g 这个只能对应浮点型，且它会将值中多余的数去掉
Format("this is %g",02.200);
返回的是：this is 2.2
n 只能对应浮点型，...